Jonathan Lalou's Blog

Archive for the ‘en-US’ Category

Tiger (Java 5) introduced new syntax, among which generics are the most used. Mustang (Java 6) did not offer anything new. Dolphin (Java 7) will introduce a new scheme, the “diamond syntax”. We deal of diamond because of the look of theses characters: “<>”

To sum up quickly, in Java 5 we have to write:

[java]
List<Integer>  myList = new ArrayList<Integer>()
Map<String, List<Double>> myMap = new Hashmap<String, List<Double>>();[/java]

On last Dolphin development releases, we can simply write:

[java]
Lis<Integer> myList = new ArrayList<>()
Map<String, List<Double>> myMap = new Hashmap<>();[/java]

There’s nothing revolutionary, but developpers will save a little more time ;-).

Abstract: we need copy all Java files in a folder and its subdirectories.

Solution:

 xcopy C:\<source folder>\*.java C:\<destination folder>\ 

Exception:

 weblogic.management.ManagementException: Unable to obtain lock on /$HOME/.../myDomain/tmp/myServer.lok. Server may already be running at weblogic.management.internal.ServerLocks.getServerLock(ServerLocks.java:159) at weblogic.management.internal.ServerLocks.getServerLock(ServerLocks.java:58) at weblogic.management.internal.DomainDirectoryService.start(DomainDirectoryService.java:75) at weblogic.t3.srvr.ServerServicesManager.startService(ServerServicesManager.java:374) at weblogic.t3.srvr.ServerServicesManager.startInStandbyState(ServerServicesManager.java:125) at weblogic.t3.srvr.T3Srvr.initializeStandby(T3Srvr.java:630) at weblogic.t3.srvr.T3Srvr.startup(T3Srvr.java:402) at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:361) at weblogic.Server.main(Server.java:67) 

Fix:

• If possible, ensure you have admin rights
• else:
  • delete /$HOME/.../myDomain/cache
  • delete /$HOME/.../myDomain/data/ldap/ldapfiles/*.lok
  • delete /$HOME/.../myDomain/data/stores/diagnostics/*
  • delete /$HOME/.../myDomain/data/stores/default/*
  • delete /$HOME/.../myDomain/tmp/*.lok

Use this:

mvn -Dtest=MyPersonnalUnitTest test

(unlike with Maven 1, you do not need specify the complete package name!)

Use this:

javap -c myClass

(do not mention .class)

On my current position, I had to update my project with Subversion every morning. It took half an hour every day ; some other guys prefered to update only once a week or twice a month… But they accepted to spend half a day for merges etc.
Yet, I found a way to make this update automatically, thanks to a planned task in Windows XP.

The command that is launched is
"C:\Program Files\TortoiseSVN\bin\TortoiseProc.exe" /command:update /path:"C:\the\path\of\my\project" /notempfile /closeonend

Thanks to another planned task, I rebuild the complete project with Maven. And on breakfast I find my project up-to-date with all jars compiled and available.

Il suffit de lancer la commande suivante, en passant eventuellement en parametre le fichier source (sinon c’est l’entree standard qui sera utilisee):

tr "àçéèêëîïôöùüÂÇÉÈÊËÎÏÔÖÙÜ" "aceeeeiioouuACEEEEIIOOUU"

Use one of the three following commands:

• tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
• tr a-z A-Z
• tr '[:lower:]' '[:upper:]'

Abstract: you have to remove duplicate lines in one file. For instance, you have a file:

foo1

foo2

foo2

Solution: use this command:

uniq myFile.txt

You’ll get:

foo1

foo2

Case: you have to sort the content of a file in Unix.

Solution

sort -d sourceFile > destinationFile